<template>
  <div>
    <!-- 警告区域 -->
    <a-alert
      show-icon
      message="注意"
      description="只允许为第三级分类设置相关参数！"
      type="warning"
      :closable="false"
    ></a-alert>
    <!-- 选择商品分类区域 -->
    <a-row class="cat_opt">
      <a-col>
        <span>选择商品分类：</span>
        <!-- 选择商品分类的级联选择框 -->
        <a-cascader
          :options="catelist"
          expand-trigger="hover"
          placeholder="请选择"
          :field-names="cateProps"
          v-model="selectedCateKeys"
          @change="handleChange"
          clearable
          change-on-select
          style="width:250px"
        >
        </a-cascader>
      </a-col>
    </a-row>
    <!-- tab 页签区域 -->
    <a-tabs type="card" v-model="activeName" @change="handleTabClick">
      <!-- 动态参数的面板 -->
      <a-tab-pane tab="动态参数" key="many">
        <!-- 添加参数的按钮 -->
        <a-button
          type="primary"
          :disabled="isBtnDisabled"
          @click="addModalVisible = true"
          >添加参数</a-button
        >
        <!-- 动态参数表格 -->
        <a-table
          rowKey="attr_id"
          :dataSource="manyTableData"
          :columns="manyColumns"
          :pagination="false"
          border
        >
          <template slot="expandedRowRender" slot-scope="record">
            <a-tag
              class="a-tag"
              closable
              color="cyan"
              v-for="(item, i) in record.attr_vals"
              :key="i"
              @close.prevent="handleClose(i, record)"
              >{{ item }}</a-tag
            >
            <a-input
              class="input-new-tag"
              v-model="record.inputValue"
              v-if="record.inputVisible"
              ref="saveTagInput"
              size="small"
              @blur="handleInputConfirm(record)"
              @keyup.enter="handleInputConfirm(record)"
            />
            <a-tag
              style="background: #fff; borderStyle: dashed;"
              @click="showInput(record)"
            >
              <a-icon type="plus" /> New Tag
            </a-tag>
          </template>
          <!-- 操作列 -->
          <a-row slot="operation" slot-scope="dataIndex, record">
            <!-- 编辑按钮 -->
            <a-button
              type="primary"
              icon="edit"
              style="margin:3px"
              @click="showEditModal(record.attr_id)"
              >编辑
            </a-button>
            <!-- 删除按钮 -->
            <a-button
              type="danger"
              icon="delete"
              style="margin:3px"
              @click="removeParams(record.attr_id)"
              >删除
            </a-button>
          </a-row>
        </a-table>
      </a-tab-pane>
      <!-- 静态属性的面板 -->
      <a-tab-pane tab="静态属性" key="only">
        <!-- 静态属性表格 -->
        <a-button
          type="primary"
          :disabled="isBtnDisabled"
          @click="addModalVisible = true"
          >添加属性</a-button
        >
        <a-table
          rowKey="attr_id"
          :dataSource="onlyTableData"
          :columns="onlyColumns"
          border
          :pagination="false"
        >
          <template slot="expandedRowRender" slot-scope="record">
            <a-tag
              closable
              color="cyan"
              v-for="(item, i) in record.attr_vals"
              :key="i"
              @close.prevent="handleClose(i, record)"
              >{{ item }}</a-tag
            >
            <a-input
              class="input-new-tag"
              v-model="record.inputValue"
              v-if="record.inputVisible"
              ref="saveTagInput"
              size="small"
              @blur="handleInputConfirm(record)"
              @keyup.enter="handleInputConfirm(record)"
            />
            <a-tag
              style="background: #fff; borderStyle: dashed;"
              @click="showInput(record)"
            >
              <a-icon type="plus" /> New Tag
            </a-tag>
          </template>
          <!-- 操作列 -->
          <a-row slot="operation" slot-scope="dataIndex, record">
            <!-- 编辑按钮 -->
            <a-button
              type="primary"
              icon="edit"
              style="margin:3px"
              @click="showEditModal(record.attr_id)"
              >编辑
            </a-button>
            <!-- 删除按钮 -->
            <a-button
              type="danger"
              icon="delete"
              style="margin:3px"
              @click="removeParams(record.attr_id)"
              >删除
            </a-button>
          </a-row>
        </a-table>
      </a-tab-pane>
    </a-tabs>
    <!-- 添加参数的对话框 -->
    <a-modal
      :title="'添加' + titleText"
      :visible="addModalVisible"
      width="50%"
      ok-text="确认"
      cancel-text="取消"
      labelAlign="left"
      @ok="addParams"
      @cancel="addModalClosed"
    >
      <!-- 添加参数的表格 -->
      <a-form-model
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <a-form-model-item :label="titleText" prop="attr_name">
          <a-input v-model="addForm.attr_name"></a-input>
        </a-form-model-item>
      </a-form-model>
    </a-modal>
    <!-- 修改参数的对话框 -->
    <a-modal
      :title="'修改' + titleText"
      :visible="editModalVisible"
      ok-text="确认"
      cancel-text="取消"
      labelAlign="left"
      @ok="editParams"
      @cancel="editModalClosed"
    >
      <!-- 修改参数的表格 -->
      <a-form-model
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <a-form-model-item :label="titleText" prop="attr_name">
          <a-input v-model="editForm.attr_name"></a-input>
        </a-form-model-item>
      </a-form-model>
    </a-modal>
  </div>
</template>

<script>
export default {
  created() {
    this.getCateList()
  },
  data() {
    return {
      // 动态参数列表
      manyColumns: [
        {
          title: '#',
          dataIndex: 'index'
        },
        {
          title: '参数名称',
          dataIndex: 'attr_name'
        },
        {
          title: '操作',
          scopedSlots: { customRender: 'operation' }
        }
      ],
      // 静态属性列表
      onlyColumns: [
        {
          title: '#',
          dataIndex: 'index'
        },
        {
          title: '属性名称',
          dataIndex: 'attr_name'
        },
        {
          title: '操作',
          scopedSlots: { customRender: 'operation' }
        }
      ],
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addModalVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editModalVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // console.log(res)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addModalClosed() {
      this.$refs.addFormRef.resetFields()
      this.addModalVisible = false
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addModalVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditModal(id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      console.log(this.editForm)
      this.editModalVisible = true
    },
    // 重置修改的表单
    editModalClosed() {
      this.$refs.editFormRef.resetFields()
      this.editModalVisible = false
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const {
          data: res
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
            // 修复编辑导致子信息丢失问题
            attr_vals: this.editForm.attr_vals
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editModalVisible = false
      })
    },
    // 根据Id删除对应的参数项
    removeParams(id) {
      const that = this
      this.$confirm({
        content: '此操作将永久删除该参数, 是否继续?',
        cancelText: '取消',
        okText: '确定',
        async onOk() {
          // 删除的业务逻辑
          const { data: res } = await that.$http
            .delete(`categories/${that.cateId}/attributes/${id}`)
            .catch(err => err)
          if (res.meta.status !== 200) {
            return that.$message.error('删除参数失败！')
          }
          that.$message.success('删除参数成功！')
          that.getParamsData()
        },
        onCancel() {
          that.$message.info('已取消删除！')
        }
      })
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    async handleInputConfirm(record) {
      if (record.inputValue.trim().length === 0) {
        record.inputValue = ''
        record.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      record.attr_vals.push(record.inputValue.trim())
      record.inputValue = ''
      record.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(record)
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(record) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${record.attr_id}`,
        {
          attr_name: record.attr_name,
          attr_sel: record.attr_sel,
          attr_vals: record.attr_vals.join(',')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(record) {
      record.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      // this.$nextTick(_ => {
      //   this.$refs.saveTagInput.$refs.input.focus()
      // })
      this.$nextTick(function() {
        this.$refs.saveTagInput.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, record) {
      record.attr_vals.splice(i, 1)
      this.saveAttrVals(record)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.a-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
